According to the material, it can be divided into white cardboard paper bags, white board paper bags, copper paper paper bags, kraft paper bags, and a small amount of special paper making.
White cardboard: the white cardboard is strong and thick. It has high stiffness, break degree and smooth skid. The paper surface is flat. The commonly used thickness is 210-300 grams of white cardboard, and the use of more than 230 white cards. The paper bags printed with white cardboard are full of color and the texture of paper is very good.
Copper sheet paper: the features of the paper are very smooth, smooth and smooth, high whiteness, high smoothness, good gloss, and the printed graphics and pictures are stereoscopic. The common thickness has 128 grams of -300 grams. The effect of copper paper printing is like white cardboard, the color is full and bright, compared with white cardboard, it is less than white cardboard. .